| Harold E. Edgerton Bouncing Ball 1939 (ca, taken) 1970s (mid-late, taken) Silver print 8 1/2 x 12 3/4 ins (21.5 x 32.3 cm) Swann Galleries - New York Courtesy of Swann Galleries (Auction, "Important Photograms & Photobooks", Dec 9, 2010, #2233, Lot 161) LL/42111 With Edgerton's signature and title, in pencil, on verso.
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